. >> president obama hailing the hero in boston. both police and citizens who helped capture the bombing suspect so quickly. he also said he has instructed the fbi and homeland security to use all resources available to provide the victims of the bombings with answers as to how and why this tragedy happened. many tonight wonder just who are the 2 young men believed responsible for so much horror? dan has reaction from people who knew them. >> profileer are baffled. 2 brothers suspected of carrying out the boston marathon bombings have been described as funny. smart kid. who loved america and areen capable of carrying out the deadly attack attacks. but authorities say 19-year-old dzhokhar tsarnaev and 26-year-old tamerlan tsarnaev did indeed plant the deadly pressure cooker bombs near the finish lane. neighbor describes dzhokhar dubbed by the fbi as suspect no. 2 as behaving nothing like a terrorist. >> this is so out of character from anything i know about this man. this young man. he couldn't have been more forthcoming. couldn't ha